8:32 a.m.
Hi guys.
I wonder if somebody might know how to customize, to change
systemd journal's colours?
I'm specifically thinking of changing 'WARN' warnings which
get - in my opinion unfortunate, for I use other than white
background colours - painted in yellow.
many thanks, L.
9:01 a.m.
On Wed, 2023-06-28 at 15:32 +0200, lejeczek via users wrote:
Hi guys.
I wonder if somebody might know how to customize, to change
systemd journal's colours?
I'm specifically thinking of changing 'WARN' warnings which
get - in my opinion unfortunate, for I use other than white
background colours - painted in yellow.
AFAIK these are just the colours used by your default pager, normally
'less', so e.g. 'man less' for more information.
poc
10:37 a.m.
On Wed, 28 Jun 2023 15:01:06 +0100
Patrick O'Callaghan <pocallaghan(a)gmail.com> wrote:
On Wed, 2023-06-28 at 15:32 +0200, lejeczek via users wrote:
> Hi guys.
>
> I wonder if somebody might know how to customize, to change
> systemd journal's colours?
> I'm specifically thinking of changing 'WARN' warnings which
> get - in my opinion unfortunate, for I use other than white
> background colours - painted in yellow.
AFAIK these are just the colours used by your default pager, normally
'less', so e.g. 'man less' for more information.
Thanks for this pointer, serendipity as just last week I was wondering
about this also.
11:08 a.m.
On Wed, 2023-06-28 at 08:37 -0700, stan via users wrote:
On Wed, 28 Jun 2023 15:01:06 +0100
Patrick O'Callaghan <pocallaghan(a)gmail.com> wrote:
> On Wed, 2023-06-28 at 15:32 +0200, lejeczek via users wrote:
> > Hi guys.
> >
> > I wonder if somebody might know how to customize, to change
> > systemd journal's colours?
> > I'm specifically thinking of changing 'WARN' warnings which
> > get - in my opinion unfortunate, for I use other than white
> > background colours - painted in yellow.
>
> AFAIK these are just the colours used by your default pager,
> normally
> 'less', so e.g. 'man less' for more information.
Thanks for this pointer, serendipity as just last week I was
wondering
about this also.
See also 'man journalctl' and search for PAGER.
poc
12:17 p.m.
On Wed, 28 Jun 2023 17:08:38 +0100
Patrick O'Callaghan <pocallaghan(a)gmail.com> wrote:
On Wed, 2023-06-28 at 08:37 -0700, stan via users wrote:
> On Wed, 28 Jun 2023 15:01:06 +0100
> Patrick O'Callaghan <pocallaghan(a)gmail.com> wrote:
>
> > On Wed, 2023-06-28 at 15:32 +0200, lejeczek via users wrote:
> > > Hi guys.
> > >
> > > I wonder if somebody might know how to customize, to change
> > > systemd journal's colours?
> > > I'm specifically thinking of changing 'WARN' warnings which
> > > get - in my opinion unfortunate, for I use other than white
> > > background colours - painted in yellow.
> >
> > AFAIK these are just the colours used by your default pager,
> > normally
> > 'less', so e.g. 'man less' for more information.
>
> Thanks for this pointer, serendipity as just last week I was
> wondering
> about this also.
See also 'man journalctl' and search for PAGER.
This is also relevant. Unfortunately, it seems that journalctl ignores
the input of SYSTEMD_LESS. It is hard to tell, because there is no
example of the kind of input it wants or whether it only accepts
options without arguments, as the default options all are. I would
probably have to look at the journalctl code to determine if they are
hard coded into the program. There is no configuration file to set
them in any case.
1:10 p.m.
On Wed, 28 Jun 2023 10:17:45 -0700
stan via users <users(a)lists.fedoraproject.org> wrote:
On Wed, 28 Jun 2023 17:08:38 +0100
Patrick O'Callaghan <pocallaghan(a)gmail.com> wrote:
> See also 'man journalctl' and search for PAGER.
This is also relevant. Unfortunately, it seems that journalctl
ignores the input of SYSTEMD_LESS. It is hard to tell, because there
is no example of the kind of input it wants or whether it only accepts
options without arguments, as the default options all are. I would
probably have to look at the journalctl code to determine if they are
hard coded into the program. There is no configuration file to set
them in any case.
So, the code for journalctl shows it reading the options from the
variables, and invoking less with those options, but it doesn't seem to
affect the behavior of running journalctl, or at least the colors don't
change. Maybe I'll look more closely at some point, but no joy for now.
1:26 p.m.
New subject: SOLUTION: Re: journal / systemd colours ?
On Wed, 28 Jun 2023 11:10:05 -0700
stan <upaitag(a)zoho.com> wrote:
On Wed, 28 Jun 2023 10:17:45 -0700
stan via users <users(a)lists.fedoraproject.org> wrote:
> On Wed, 28 Jun 2023 17:08:38 +0100
> Patrick O'Callaghan <pocallaghan(a)gmail.com> wrote:
> > See also 'man journalctl' and search for PAGER.
>
> This is also relevant. Unfortunately, it seems that journalctl
> ignores the input of SYSTEMD_LESS. It is hard to tell, because
> there is no example of the kind of input it wants or whether it
> only accepts options without arguments, as the default options all
> are. I would probably have to look at the journalctl code to
> determine if they are hard coded into the program. There is no
> configuration file to set them in any case.
So, the code for journalctl shows it reading the options from the
variables, and invoking less with those options, but it doesn't seem
to affect the behavior of running journalctl, or at least the colors
don't change. Maybe I'll look more closely at some point, but no joy
for now.
Operator error. Exporting the wrong name because of a cut and paste.
Once I fixed that, definitely works to change colors in journalctl
output, will have to tune it to get what I want.
I put this in my .bashrc so everything is set on login.
SYSTEMD_PAGER=less
export SYSTEMD_PAGER
SYSTEMD_LESS="[list of less options]"
export SYSTEMD_LESS
10:44 a.m.
New subject: SOLUTION: Re: journal / systemd colours ?
On 28/06/2023 20:26, stan via users wrote:
On Wed, 28 Jun 2023 11:10:05 -0700
stan <upaitag(a)zoho.com> wrote:
> On Wed, 28 Jun 2023 10:17:45 -0700
> stan via users <users(a)lists.fedoraproject.org> wrote:
>
>> On Wed, 28 Jun 2023 17:08:38 +0100
>> Patrick O'Callaghan <pocallaghan(a)gmail.com> wrote:
>>> See also 'man journalctl' and search for PAGER.
>> This is also relevant. Unfortunately, it seems that journalctl
>> ignores the input of SYSTEMD_LESS. It is hard to tell, because
>> there is no example of the kind of input it wants or whether it
>> only accepts options without arguments, as the default options all
>> are. I would probably have to look at the journalctl code to
>> determine if they are hard coded into the program. There is no
>> configuration file to set them in any case.
> So, the code for journalctl shows it reading the options from the
> variables, and invoking less with those options, but it doesn't seem
> to affect the behavior of running journalctl, or at least the colors
> don't change. Maybe I'll look more closely at some point, but no joy
> for now.
Operator error. Exporting the wrong name because of a cut and paste.
Once I fixed that, definitely works to change colors in journalctl
output, will have to tune it to get what I want.
I put this in my .bashrc so everything is set on login.
SYSTEMD_PAGER=less
export SYSTEMD_PAGER
SYSTEMD_LESS="[list of less options]"
export SYSTEMD_LESS
_______________________________________________
Not exactly, I'd not think of
it as _the_ solution - (I much
prefer to up&down pages via actual mechanical scrolling) -
as I use, always I've had, SYSTEMD_PAGER=cat so...
man page for 'journalctl' has a shor section:
When outputting to a tty, lines are colored according to
priority: lines of level ERROR and higher are colored red;
lines of level NOTICE and higher are highlighted;
lines of level DEBUG are colored lighter grey; other lines are
displayed normally.
would be nice to be able to customize those & if 'systemd'
delegates declaration of that 'highlighting' colour then
these below do not do it:
a) terminal-colors.d - perhaps systemd/journal ignores it
altogether
b) gnome-terminal has config for 'Highlight colour'
It would be great/the best to have that functionality
internal to systemd/journal - thus, if authors/devel might
read here - please think of this conversation's subject as
possible future addition/enhancement to the software.
8:15 a.m.
New subject: SOLUTION: Re: journal / systemd colours ?
On Thu, 29 Jun 2023 17:44:01 +0200
lejeczek via users <users(a)lists.fedoraproject.org> wrote:
On 28/06/2023 20:26, stan via users wrote:
> Operator error. Exporting the wrong name because of a cut and
> paste. Once I fixed that, definitely works to change colors in
> journalctl output, will have to tune it to get what I want.
> I put this in my .bashrc so everything is set on login.
> SYSTEMD_PAGER=less
> export SYSTEMD_PAGER
> SYSTEMD_LESS="[list of less options]"
> export SYSTEMD_LESS
> _______________________________________________
Not exactly, I'd not think of it as _the_ solution - (I much
This is correct. After I posted this, I found that it is impossible to
actually set the colors in journalctl because they are hard coded as
escape sequences when the data is written into the journal. What I had
done is remove the R option to less, which turns off such escape
sequences. In my case, the less options I set for color then seems to
highlight the ESC in light red, so I know which lines journalctl wants
to highlight, but not their status. That isn't optimal, but the
horrible dark blue on black background is gone, so I can live with it.
prefer to up&down pages via actual mechanical scrolling) -
as I use, always I've had, SYSTEMD_PAGER=cat so...
man page for 'journalctl' has a shor section:
When outputting to a tty, lines are colored according to
priority: lines of level ERROR and higher are colored red;
lines of level NOTICE and higher are highlighted;
lines of level DEBUG are colored lighter grey; other lines are
displayed normally.
would be nice to be able to customize those & if 'systemd'
delegates declaration of that 'highlighting' colour then
these below do not do it:
a) terminal-colors.d - perhaps systemd/journal ignores it
altogether
b) gnome-terminal has config for 'Highlight colour'
It would be great/the best to have that functionality
internal to systemd/journal - thus, if authors/devel might
read here - please think of this conversation's subject as
possible future addition/enhancement to the software.
Yes, this would be the solution. Unless there is some setting in
systemd already that allows for changing the colors, they are set by
systemd when it writes things into the journal, probably based on what
the application requests when it reports the error.
8:46 a.m.
New subject: SOLUTION: Re: journal / systemd colours ?
On 30 Jun 2023, at 14:15, stan via users
<users(a)lists.fedoraproject.org> wrote:
On Thu, 29 Jun 2023 17:44:01 +0200
lejeczek via users <users(a)lists.fedoraproject.org
<mailto:users@lists.fedoraproject.org>> wrote:
> On 28/06/2023 20:26, stan via users wrote:
>> Operator error. Exporting the wrong name because of a cut and
>> paste. Once I fixed that, definitely works to change colors in
>> journalctl output, will have to tune it to get what I want.
>> I put this in my .bashrc so everything is set on login.
>> SYSTEMD_PAGER=less
>> export SYSTEMD_PAGER
>> SYSTEMD_LESS="[list of less options]"
>> export SYSTEMD_LESS
>> _______________________________________________
> Not exactly, I'd not think of it as _the_ solution - (I much
This is correct. After I posted this, I found that it is impossible to
actually set the colors in journalctl because they are hard coded as
escape sequences when the data is written into the journal. What I had
done is remove the R option to less, which turns off such escape
sequences. In my case, the less options I set for color then seems to
highlight the ESC in light red, so I know which lines journalctl wants
to highlight, but not their status. That isn't optimal, but the
horrible dark blue on black background is gone, so I can live with it.
I would be nice to be able to configure the colours used. Would need a PR against systemd
I expect to get this changed.
One hack would be to edit the output and replace the escape sequence for the poor colour
to use a replacement using sed I guess.
For example change the blue to red.
SYSTEMD_COLORS=16 journalctl | sed 's/\x1b\[0;34m/\x1b\[0;31m/g' | more
I use more not less and notice that less does not show the coloured output.
Barry
> prefer to up&down pages via actual mechanical scrolling) -
> as I use, always I've had, SYSTEMD_PAGER=cat so...
>
> man page for 'journalctl' has a shor section:
> When outputting to a tty, lines are colored according to
> priority: lines of level ERROR and higher are colored red;
> lines of level NOTICE and higher are highlighted;
> lines of level DEBUG are colored lighter grey; other lines are
> displayed normally.
>
> would be nice to be able to customize those & if 'systemd'
> delegates declaration of that 'highlighting' colour then
> these below do not do it:
> a) terminal-colors.d - perhaps systemd/journal ignores it
> altogether
> b) gnome-terminal has config for 'Highlight colour'
>
> It would be great/the best to have that functionality
> internal to systemd/journal - thus, if authors/devel might
> read here - please think of this conversation's subject as
> possible future addition/enhancement to the software.
Yes, this would be the solution. Unless there is some setting in
systemd already that allows for changing the colors, they are set by
systemd when it writes things into the journal, probably based on what
the application requests when it reports the error.
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10:54 a.m.
New subject: SOLUTION: Re: journal / systemd colours ?
On Fri, 30 Jun 2023 14:46:38 +0100
Barry Scott <barry(a)barrys-emacs.org> wrote:
> On 30 Jun 2023, at 14:15, stan via users
> <users(a)lists.fedoraproject.org> wrote:
> This is correct. After I posted this, I found that it is
> impossible to actually set the colors in journalctl because they
> are hard coded as escape sequences when the data is written into
> the journal. What I had done is remove the R option to less, which
> turns off such escape sequences. In my case, the less options I
> set for color then seems to highlight the ESC in light red, so I
> know which lines journalctl wants to highlight, but not their
> status. That isn't optimal, but the horrible dark blue on black
> background is gone, so I can live with it.
I would be nice to be able to configure the colours used. Would need
a PR against systemd I expect to get this changed.
One hack would be to edit the output and replace the escape sequence
for the poor colour to use a replacement using sed I guess.
For example change the blue to red.
SYSTEMD_COLORS=16 journalctl | sed 's/\x1b\[0;34m/\x1b\[0;31m/g' |
more
I use more not less and notice that less does not show the coloured
output.
Barry
Thanks, this worked for me with both more and less, and the red is much
more palatable. I think the default for less is not to have --use-color
set, so that is probably why it didn't work for you. I set it on login.
This could be put as a function in .bashrc so that invoking something
like jrctl would run it automatically. I'm not sure how that would
work for the OP who wanted to use cat though.
I tried
$ SYSTEMD_COLORS=16 journalctl -r | sed 's/\x1b\[0;34m/\x1b\[0;31m/g' | cat -
and it worked to send the output colored correctly to stdout, but there
was no paging, it just was a continuous stream.
10:36 a.m.
On Wed, 28 Jun 2023 15:32:12 +0200
lejeczek via users <users(a)lists.fedoraproject.org> wrote:
Hi guys.
I wonder if somebody might know how to customize, to change
systemd journal's colours?
I'm specifically thinking of changing 'WARN' warnings which
get - in my opinion unfortunate, for I use other than white
background colours - painted in yellow.
Thanks for asking this. I was just thinking about this last week
because I don't like the dark blue color that is used for some entries
in the journal. But it slipped away into the stream of daily noise, so
this reminded me.
313
days inactive
315
days old
11 comments
4 participants
participants (4)
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Barry Scott -
lejeczek -
Patrick O'Callaghan -
stan